ASHRAE on UVGI 2014 Keith Jordan Sanuvox Technologies kjordan@sanuvox.com
The agenda ASHRAE : UVGI 1) SCIENCE OF UVC 2) IN DUCT AIR PURIFICATION 3) UPPER ROOM UVGI 4) EVAPORATOR COIL UVGI 5) HOSPITAL ACQUIRED INFECTIONS AND UVGI
ASHRAE Using UV - Air Past, Purification Present & Future 2005: ASHRAE Technical Group 2.UVAS 2008: First Handbook chapter: UVC Lamp Systems: Chapter 16 2011 Handbook: HVAC Applications : Chapter 60: Ultraviolet Air and Surface Treatment Applications 2012 Handbook: HVAC Systems and Equipment: Chapter 17: Ultraviolet Lamp Systems which includes information from Research Project 1509-RP on the degradation of Typical HVAC Materials, Filters and Components Irradiated by UVC Energy. 2012: ASHRAE IAQ Guide: Best Practices recognizes the use of UVC Lamp Systems Moving Forward: More Research Projects Expanding the knowledge base of UVC Establishing Performance Standards and Testing for UVC
2 year double blind office study - McGill University and Lancet Medical Journal 2000 Using UV - Air Purification Using UVGI for Air Sterilization - EPA/Homeland Security 2008 Report on Assessment of Germicidal UV Lights in the Sputum Induction Room at the Montreal Chest Institute. McGill University 2000 Effect of Ultraviolet germicidal irradiation in the heating, ventilation and air conditioning system on ventilator associated pneumonia in a neonatal intensive care unit Journal of Perinatology. 2011 Home Isolation & use of portable HEPA/UVGI units Toronto Public Health. Nov. 2012 UVC: Florida Hospital Puts HVAC Under a New Light, Engineered Systems Feb. 2003 Guidelines on the Design and Operation of HVAC Systems in Disease Isolation Areas, TG 252. Nov. 2000 - US ARMY Advanced HVAC Systems for Improving Indoor Environmental Quality and Energy Performance of California K-12 School. Applications Guide for Off the Shelf Equipment for UVC Use. May 2006 CDC: Guideline for Disinfection and Sterilization in Healthcare Facilities, 2008 Perpendicular Placement Parallel Placement Life-Cycle Cost Simulation of In-Duct Ultraviolet Germicidal Irradiation Systems. 2011 The Importance of Bioaerosols in Hospital Infections and the Potential for Control using Germicidal Ultraviolet Irradiation. 2004 Using UVGI to counter contaminant dispersion. IFHE Digest 2011 The Application of Ultraviolet Germicidal Irradiation to Control Transmission of Airborne
Sun s UV rays
How UV Works UV Causes Microorganism To Stop Functioning Properly More Importantly Destroying Bio-Contaminant s Greatest Weapon The Ability to Reproduce
Micro-organism Susceptibility to UVC %Disinfection Aspergillus Niger 330,000
UVGI Lamps - Mercury, Xenon, Argon Gas Mixture - Quartz to allow transmission of UVC - Doped to emit 254nm specifically - As gas mixture uses itself up, replacement of lamp is necessary - 1 year or 2 year lamps
Lamp Cooling and Lamp Fouling The two greatest factors that influence the efficiency of a UV Lamp are: A) Lamp Cooling B) Lamp Fouling
Using UV In Duct Air Purification - Return or supply duct - Treat entire wing/multiple rooms with a single install - Airborne UV Disinfection to protect occupants and vaccinate the building.
Using UV In Duct Air Purification Variables for Sizing for Air Sterilization Dimension of the installation point in duct: W x H Volume of air passing through duct
Upper Air UV
Upper Air UV Typically installed on a wall above seven feet, the louvers reflect the UV to the upper air region of the space. As air currents bring bacteria to the upper air of the space, they are irradiated with UVC One of the first type UV systems, they faded in use, and now have made a resurgence because of Multi-drug resistant organisms and Hospital Acquired Infections. Most cases, more than one unit is needed in a room to adequately cover the space. Typically used in TB applications Sizing: Room dimensions and contaminant to be irradiated
Evaporator Coil UV
UVGI for Coil Cleaning Benefits Include: Destroys mold and other microbial growth (bio-film) on the evaporator coil as well as biological odors Potential energy savings (average 5-15%) from a consistent, clean coil Eliminates coil maintenance as pressure washing can damage the coil fins and impact debris in the center of the coil Eliminates need for Drain Pan Tabs Can reduce static pressure (w.g.) through coil Improve cooling transfer efficiency Potentially raise cooling tower water temperature Potentially lengthen the lifespan of the coil by eliminating corrosive Biofilm University tested & published results in The Lancet Medical Journal - 99% microbial and endotoxin reduction in AHU - 40% reduction in respiratory illness - 20% reduction in all worker symptoms reducing abenteeism
Before UV (Incubation 4 days) **After 10 hours of UV exposure (Incubation 4 days) **The lines in the agar are the impressions made from pressing the plates against the fins of the coil
The results are always the same.
Using UV Indoors Object Purification Both Sides will keep a coil clean Downstream vs. Upstream We prefer Upstream as a first choice.
Using UV Coil Sizing Sizing Performance Upstreamsizing for Coil 140 Wx120 H
UV Hospital Acquired infections Infection Prevention: The Threat of Dirty Air